#include<stdio.h>    //stdio.stdlib标准库

 #include<stdlib.h>

 //代码重用，    函数的诞生，C语言主要是函数组成

 //写C语言，就是写函数

 //主要是代码重用，模块化（便于定位错误），

 //函数就是对某一特定功能的抽象

 void printfR(double R)

 {

     printf("体积=%f",  /  * 3.14*R*R*R);

     printf("\n表面积=%f",  * 3.14*R*R);

 }

 void main123()

 {

     double R=;

     printfR(R);

     //printf("体积=%f", 4 / 3 * 3.14*R*R*R);

     //printf("\n表面积=%f", 4 * 3.14*R*R);

     double R1 = ;

     printfR(R1);

     //printf("体积=%f", 4 / 3 * 3.14*R1*R1*R1);

     //printf("\n表面积=%f", 4 * 3.14*R1*R1);

     double R2 = ;

     printfR(R2);

     //printf("体积=%f", 4 / 3 * 3.14*R2*R2*R2);

     //printf("\n表面积=%f", 4 * 3.14*R2*R2);

     system("pause");

 }

 #include<stdio.h>

 #include<stdlib.h>

 #include<Windows.h>

 void main(){

     //windows

     //keybd_event(0x5b,0,0,0);//键盘按下Windows键

     //keybd_event(0x5b,0,2,0);//键盘松开

     //windows+R

     //keybd_event(0x5b,0,0,0);//键盘按下Windows键

     //keybd_event('E',0,0,0);//E按下

     //keybd_event('E',0,2,0);//E松开

     //keybd_event(0x5b,0,2,0);//键盘松开

     //打开记事本

     keybd_event(0x5b,,,);

     keybd_event('R',,,);

     keybd_event('R',,,);

     keybd_event(0x5b,,,);

     Sleep();

     //需要提前把输入法设置为英文大写状态

     keybd_event('N',,,);

     keybd_event('N',,,);

     keybd_event('O',,,);

     keybd_event('O',,,);

     keybd_event('T',,,);

     keybd_event('T',,,);

     keybd_event('E',,,);

     keybd_event('E',,,);

     keybd_event('P',,,);

     keybd_event('P',,,);

     keybd_event('A',,,);

     keybd_event('A',,,);

     keybd_event('D',,,);

     keybd_event('D',,,);

     Sleep();

     keybd_event(0x0d,,,);//回车

     keybd_event(0x0d,,,);

     Sleep();

     exit();//退出

 }

 #include<stdio.h>

 //参数会开辟一小段内存，接收一个新的变量

 void change(int a){//形式参数，角色

     a=;//给新开辟的内存赋值

     printf("\nchange a=%x",&a);

 }

 void main(){

     int a=;

     printf("main a=%x",&a);//地址不同，说明不是同一个变量

     change(a);//实参，实际调用时刻的参数

     printf("\n%d",a);

     getchar();

 }

 #include<stdio.h>

 #include<stdlib.h>

 #include<Windows.h>

 void openbaidu(){

     ShellExecuteA(,"open","http://www.baidu.com",,,);

 }

 void close(){

     system("taskkill /f /im 360se.exe");

 }

 void search(){

     keybd_event('X',,,);//按下

     keybd_event('X',,,);//松开

     keybd_event('I',,,);

     keybd_event('I',,,);

     keybd_event('A',,,);

     keybd_event('A',,,);

     keybd_event('N',,,);

     keybd_event('N',,,);

     keybd_event('H',,,);

     keybd_event('H',,,);

     keybd_event('U',,,);

     keybd_event('U',,,);

     keybd_event('A',,,);

     keybd_event('A',,,);

     Sleep();

     //回车

     keybd_event(0x0d,,,);

     keybd_event(0x0d,,,);

 }

 void click(){

     SetCursorPos(, );

     mouse_event(MOUSEEVENTF_LEFTDOWN,,,,);

     mouse_event(MOUSEEVENTF_LEFTUP,,,,);

     SetCursorPos(, );

     mouse_event(MOUSEEVENTF_LEFTDOWN,,,,);

     mouse_event(MOUSEEVENTF_LEFTUP,,,,);

 }

 void main(){

     openbaidu();

     Sleep();

     search();

     Sleep();

     click();

     Sleep();

     close();

 }